tree 0d292ced5cce778bc16387b1d928117aead52996
parent b6b038a24a826fe22d9823722cfbbbd3ad7a3021
author Paolo 'Blaisorblade' Giarrusso <[EMAIL PROTECTED]> Thu, 28 Jul 2005
01:43:31 -0700
committer Linus Torvalds <[EMAIL PROTECTED]> Thu, 28 Jul 2005 06:25:48 -0700
[PATCH] uml: add skas0 command-line option
This adds the "skas0" parameter to force skas0 operation on SKAS3 host and
shows which operating mode has been selected.
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <[EMAIL PROTECTED]>
Signed-off-by: Jeff Dike <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
arch/um/kernel/process.c | 35 +++++++++++++++++++++++++----------
arch/um/kernel/um_arch.c | 19 +++++++++++++++++++
2 files changed, 44 insertions(+), 10 deletions(-)
diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
--- a/arch/um/kernel/process.c
+++ b/arch/um/kernel/process.c
@@ -212,12 +212,26 @@ static int stop_ptraced_child(int pid, i
static int force_sysemu_disabled = 0;
+int ptrace_faultinfo = 1;
+int proc_mm = 1;
+
+static int __init skas0_cmd_param(char *str, int* add)
+{
+ ptrace_faultinfo = proc_mm = 0;
+ return 0;
+}
+
static int __init nosysemu_cmd_param(char *str, int* add)
{
force_sysemu_disabled = 1;
return 0;
}
+__uml_setup("skas0", skas0_cmd_param,
+ "skas0\n"
+ " Disables SKAS3 usage, so that SKAS0 is used, unless you \n"
+ " specify mode=tt.\n\n");
+
__uml_setup("nosysemu", nosysemu_cmd_param,
"nosysemu\n"
" Turns off syscall emulation patch for ptrace (SYSEMU)
on.\n"
@@ -359,12 +373,10 @@ void forward_pending_sigio(int target)
kill(target, SIGIO);
}
-int ptrace_faultinfo = 0;
-int proc_mm = 1;
-
extern void *__syscall_stub_start, __syscall_stub_end;
#ifdef UML_CONFIG_MODE_SKAS
+
static inline void check_skas3_ptrace_support(void)
{
struct ptrace_faultinfo fi;
@@ -375,6 +387,7 @@ static inline void check_skas3_ptrace_su
n = ptrace(PTRACE_FAULTINFO, pid, 0, &fi);
if (n < 0) {
+ ptrace_faultinfo = 0;
if(errno == EIO)
printf("not found\n");
else {
@@ -382,8 +395,10 @@ static inline void check_skas3_ptrace_su
}
}
else {
- ptrace_faultinfo = 1;
- printf("found\n");
+ if (!ptrace_faultinfo)
+ printf("found but disabled on command line\n");
+ else
+ printf("found\n");
}
init_registers(pid);
@@ -396,13 +411,13 @@ int can_do_skas(void)
if (os_access("/proc/mm", OS_ACC_W_OK) < 0) {
proc_mm = 0;
printf("not found\n");
- goto out;
- }
- else {
- printf("found\n");
+ } else {
+ if (!proc_mm)
+ printf("found but disabled on command line\n");
+ else
+ printf("found\n");
}
-out:
check_skas3_ptrace_support();
return 1;
}
diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c
--- a/arch/um/kernel/um_arch.c
+++ b/arch/um/kernel/um_arch.c
@@ -38,6 +38,9 @@
#include "choose-mode.h"
#include "mode_kern.h"
#include "mode.h"
+#ifdef UML_CONFIG_MODE_SKAS
+#include "skas.h"
+#endif
#define DEFAULT_COMMAND_LINE "root=98:0"
@@ -318,6 +321,7 @@ int linux_main(int argc, char **argv)
unsigned long avail, diff;
unsigned long virtmem_size, max_physmem;
unsigned int i, add;
+ char * mode;
for (i = 1; i < argc; i++){
if((i == 1) && (argv[i][0] == ' ')) continue;
@@ -338,6 +342,21 @@ int linux_main(int argc, char **argv)
exit(1);
}
#endif
+
+#ifndef CONFIG_MODE_SKAS
+ mode = "TT";
+#else
+ /* Show to the user the result of selection */
+ if (mode_tt)
+ mode = "TT";
+ else if (proc_mm && ptrace_faultinfo)
+ mode = "SKAS3";
+ else
+ mode = "SKAS0";
+#endif
+
+ printf("UML running in %s mode\n", mode);
+
uml_start = CHOOSE_MODE_PROC(set_task_sizes_tt, set_task_sizes_skas, 0,
&host_task_size, &task_size);
-
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